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Intangible Assets - Schedule of Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance $ 320.4  
Ending balance 265.7 $ 320.4
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 610.7 592.2
Additions 13.7 25.7
Additions arising on acquisitions 37.6 15.3
Removal of fully amortized assets (112.6) (44.4)
Disposals   (1.4)
Impact of foreign exchange (8.9) 23.3
Ending balance 540.5 610.7
Accumulated depreciation    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (290.3) (218.9)
Amortization 102.0 104.6
Removal of fully amortized assets 112.6 44.4
Impact of foreign exchange (4.9) 11.2
Ending balance (274.8) (290.3)
Client Relationships    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 256.3  
Ending balance 231.4 256.3
Client Relationships | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 471.9 463.2
Additions 0.0 0.0
Additions arising on acquisitions 25.2 13.1
Removal of fully amortized assets (25.4) (24.3)
Disposals   0.0
Impact of foreign exchange (7.6) 19.9
Ending balance 464.1 471.9
Client Relationships | Accumulated depreciation    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (215.6) (185.0)
Amortization 46.3 45.6
Removal of fully amortized assets 25.4 24.3
Impact of foreign exchange (3.8) 9.3
Ending balance (232.7) (215.6)
Contract Backlog    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 17.2  
Ending balance 8.3 17.2
Contract Backlog | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 48.6 50.2
Additions 0.0 0.0
Additions arising on acquisitions 12.4 1.7
Removal of fully amortized assets (47.8) (6.1)
Disposals   0.0
Impact of foreign exchange (0.8) 2.8
Ending balance 12.4 48.6
Contract Backlog | Accumulated depreciation    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (31.4) (2.8)
Amortization 21.3 33.3
Removal of fully amortized assets 47.8 6.1
Impact of foreign exchange (0.8) 1.4
Ending balance (4.1) (31.4)
Software and other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 46.9  
Ending balance 26.0 46.9
Software and other | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 90.2 78.8
Additions 13.7 25.7
Additions arising on acquisitions 0.0 0.5
Removal of fully amortized assets (39.4) (14.0)
Disposals   (1.4)
Impact of foreign exchange (0.5) 0.6
Ending balance 64.0 90.2
Software and other | Accumulated depreciation    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (43.3) (31.1)
Amortization 34.4 25.7
Removal of fully amortized assets 39.4 14.0
Impact of foreign exchange (0.3) 0.5
Ending balance $ (38.0) $ (43.3)